Constant-temperature control method and system

Abstract

The invention discloses a constant temperature control method. The method comprises the following steps that a temperature error, an error accumulation and a temperature control output are calculated;when the temperature control output is greater than a first preset threshold, the heater power is adjusted according to the first preset threshold, and a preset constant temperature and a detection voltage are obtained; the temperature error is calculated according to the preset constant temperature and the detection voltage, and whether the temperature error is less than zero or not is judged, if yes, the error accumulation is calculated, and if not, the error accumulation is not calculated; and when the temperature control output is smaller than a second preset threshold, the heater power is adjusted according to the second preset threshold, and the preset constant temperature and the detection voltage are obtained; and the temperature error is calculated according to the preset constant temperature and the detection voltage, whether the temperature error is greater than zero or not is judged, if yes, the error accumulation is calculated, and if not, the error accumulation is not calculated. Correspondingly, the invention further discloses a constant temperature control system. By adopting the constant temperature control method and system, timely adjustment can be carried out according to the real-time water temperature, and the stability of temperature regulation is improved.

Description

technical field [0001] The invention relates to a bathroom equipment control technology, in particular to a constant temperature control method and system. Background technique [0002] At present, bathing equipment such as bathtubs and the like all have a constant temperature function to control the water temperature at a preset temperature. The commonly used method uses the hysteresis loop control method to detect the water temperature in real time, control the heater to heat when the water temperature is lower than the lower limit, and control the heater to stop heating when the water temperature is higher than the upper limit, so as to control the water temperature at one of the preset temperature. within the range. [0003] The comparative document CN204246022U discloses a dynamic constant temperature static bath instrument, which is characterized in that: the static bath instrument includes a housing, a power line, a water inlet and a water outlet are arranged on the ...

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Problems solved by technology

[0004] However, in the hysteresis control of the prior art, if the difference between the lower limit value and the upper limit value is too large, it is easy to cause the temperature to swing back and forth between the two set values; otherwise, the relay will be opened many times in a short time. Close the heater, damage the life of the heater

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